[Download] "Turbo Codes--Introduction and Applications (Report)" by Annals of DAAAM & Proceedings # eBook PDF Kindle ePub Free
eBook details
- Title: Turbo Codes--Introduction and Applications (Report)
- Author : Annals of DAAAM & Proceedings
- Release Date : January 01, 2010
- Genre: Engineering,Books,Professional & Technical,
- Pages : * pages
- Size : 56 KB
Description
1.INTRODUCTION According to Sklar (Sklar, 2002), turbo codes were first introduced in 1993 by Berrou, Glavieux, and Thitimjshima achieving a bit-error probability of 10-5 using a rate 1/2 code over an additive white Gaussian noise channel and BPSK modulation at an [E.sub.b]/[N.sub.0] of 0.7 dB. The codes are constructed by using two or mote component codes on different interleaved versions of the same information sequence. For a system with two component codes, the concept behind turbo decoding is to pass soft decisions from the output of one decoder to the input of the other decoder, and to iterate this process several times so as to produce more reliable decisions (Sklar, 2002). The generalization of the original turbo coding scheme to a multiple parallel concatenation of convolutional encoders is called a multiple turbo code (MTC) (Divsalar & Pollara, 1995). It is possible to design turbo codes that can achieve near-Shannonlimit performance where rate constituent codes are used in the encoder and they are designed by using primitive polynomials (Divsalar & Pollara, 1995).
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